FR2567110A1 - CONVEYOR ROLL - Google Patents

Abstract

CONVEYOR ROLLER CONSISTS OF A RIGID CORE 2 AND AN ELASTIC CONCENTRIC SLEEVE 3 ENGAGED FORCE ON THE TOP, AND IN WHICH IS INCORPORATED A BUCKLE SPRING 5 FORMING A RING, projecting radially towards the interior of its internal bore 4. The spring A BOUDIN 5 IS ENGAGED IN AN ANNULAR THROAT 6 OF THE CORE 2 AND PREVENTS ANY AXIAL DISPLACEMENT OF THE ELASTIC SLEEVE 3 OF THE ROLLER.

Description

1 2567110

  The invention relates to a conveyor roller consisting of a rigid core and an elastic concentric sleeve which is forcibly engaged,

  by its inner bore, on the outer surface of the roller core.

  Rollers of this kind, for example for transporting paper, are generally known and offer this advantage that it is not

  no need to completely change a roller when its side surface

  the exterior is no longer sufficiently suitable for operation, as a result

wear.

  The disadvantage of known conveyor rollers, composed of a core and a concentric sleeve, is that as the elasticity of the material from which the sleeve is made increases, the latter has more

  in addition tend to move in an axial direction beyond the core. From-

  On the other hand, a high elasticity of the sleeve increases the friction. Consequently, in order to obtain rollers having an appropriate friction, it is possible to

  so far only make them in one piece from a suitable material

  slightly elastic and, therefore, when a state of wear is reached, it

  must be changed completely, i.e. including their sleeve

  bond on which the roller body is vulcanized.

  The object of the invention is to create a conveyor roller which

  is formed of a core on which a concentric sleeve can be applied

  that replaceable elastic which is held securely against sliding

axial on the core.

  Starting from a conveyor roller of the kind described above

  Finally, it is proposed, to solve the problem posed, to include in the sleeve of the roller at least one coil spring closed on itself and constituting an endless ring, which projects through at least part of its

  section of the inner bore of the sleeve and engages in an annular groove

  the area provided in the outer surface of the roller core.

  According to the invention, thanks to the coil spring, the core can be provided with a very elastic sleeve without it being able to move over the core. The annular coil spring is engaged, preferably by force, in the annular groove of the core and is maintained therein, in

  by virtue of its firm connection with the roller sleeve.

  To simply exclude an axial play of the projecting section portion of the coil spring in the annular groove, an embodiment of the invention provides that the annular groove has a trapezoidal section, the width of the bottom of the groove ring finger being more

  smaller than the width of the protruding section portion of the ball spring

  din, and the depth of the annular groove being greater than the height

  the protruding section of the spring.

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  Thanks to this constitution of the annular throat section

  laire, the coil spring, forcibly engaged by a part of its section

  in the annular groove, applies without play against the sides of it

  ci, so that any movement back and forth of the coil spring, and therefore also of the roller sleeve, which would promote wear, is excluded. To securely hold a very elastic sleeve on a

  rigid core, a spring included in this roller sleeve is sufficient. In pa-

  In this case, it is recommended to provide the coil spring in the sleeve.

  of the roller and the annular groove in the core, located in the middle of the roller.

  In principle, even for wide transport rollers, it suffices to have a coil spring in the middle, between the core and the sleeve, but it may be advisable, instead, to provide, in each of the two marginal zones of the roller, a coil spring in the

sleeve and a groove in the core.

  Thanks to this design according to the invention, it is possible to

  prevent axial expansion as well as axial contraction of the man-

elastic roll cover.

  Thanks to the fixing according to the invention of the sleeve on the core, it is possible to manufacture the latter from a deformable material

  elastically which has a Shore hardness of less than 40. Such a ma-

  third, injection molded in liquid form, could not be used for

  manufacture of a sleeve, without fixing it in accordance with the invention

  tion, because it has been shown by numerous experiments that the roller sleeves made of this material move relative to the core, in a short time, even under slight effort. However, this material is distinguished by an extremely good friction and, consequently, it is excellent as a roller sleeve if it is fixed sufficiently on

the core.

  Finally, an embodiment of the invention also provides that the turns of the coil spring are wrapped, at least each up to the level of the pitch diameter of the ring formed by this spring, by

  the elastically deformable material of the roller sleeve.

  By wrapping the coils of the coil spring, we obtain

  holds a particularly good connection between the latter and the sleeve of the roller, so that the coil spring is not liable to separate from

  this one following a crushing movement.

  It is within the scope of the invention to apply a coating

  brass to the coil spring turns or to apply an agent

  attachment to these turns, for example by immersion, to improve

  core the connection between the roller sleeve and the coil spring. In

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  general, it will suffice to apply under tension, on the molding core of the roller sleeve, the ends, connected to each other, of a coil spring forming a ring, so that between the turns of the latter, in principle without spacing, it forms interstices of passage for the material from which the sleeve is manufactured. During the manufacture of the sleeve, the material of it thus flows into the cavity delimited by the

  coil spring and can fill it, preferably completely.

  Two modes of execution of a conveyor roller, given to

  As examples, are shown in the drawings, each in section.

  In Figure 1, on a section of axis 1 is mounted a core

  rigid roller 2 which is provided with an elastic sleeve 3.

  Relative to the inner bore 4 of the sleeve 3 of the wheel

  water, in the middle, protrudes a coil spring 5 which is embedded in the material

  of the sleeve 3, so that at least part of its section exceeds

  radially inward of bore 4.

  The part of the coil spring 5, closed on itself in an endless ring, which projects from the internal bore 4, engages in a

  annular groove 6 of trapezoidal section of the core 2.

  In Figure 2, on the section of axis 1 is arranged a

  rigid roller core 2 'which is provided with an elastic sleeve 3'.

  Compared to the inner bore 4 'of the sleeve 3' of the wheel

  water, in the two lateral zones of the roller, protrude springs

  flange 5 'which are embedded in the material of the sleeve 3'.

  In the core 2 'are provided annular grooves 6' of

  trapezoidal section correspondingly arranged to the ball springs

din 5 '.

Claims (6)

CLAIMS R E V E N D I C A T I 0 N S   1.- Conveyor roller consisting of a rigid core and a   elastic concentric sleeve which is forcibly engaged by its internal bore   térieur, on the outside surface of the nucleus, characterized in that   at least one ball spring is incorporated in the sleeve (3,3 ') of the roller   din (5,5 ') closed on itself in an endless ring, which projects by at least part of its section from the internal bore (4,4') of the sleeve (3,3 ') and s' engages in an annular groove (6,6 ') provided in the surface   outside of the roller core (2,2 ').   2.- Roller according to claim 1, characterized in that   that the annular groove (6,6 ') has a trapezoidal section, the width   geur of the bottom of this groove (6,6 ') being smaller than the width of the projecting section part of the coil spring (5,5'), and the depth of this annular groove (6,6 ') being more great that the height of this   protruding section of the spring (5.5 ').   3. Roll according to either of claims 1 or 2,   characterized in that the coil spring (5) is provided in the man-   cap (3) of the roller and the annular groove (6) in the core (2), in the middle of the roller.   4. Roll according to either of claims 1 or 2,   characterized in that in each of the two marginal areas of the road   water is provided, in the sleeve (3 '), a coil spring (5') and in the core (2 '), a groove (6').   5. Roll according to any one of claims 1 to 4,   characterized in that the sleeve (3.3 ') of the roller is made of an elastically deformable material which has a Shore hardness of less than 40.   6. Roll according to any one of claims 1 to 5,   characterized by the fact that the coils of the coil spring (5.5 ') are   veloppées, at least each up to the level of the original diameter of the year   neau formed by this spring, by the elastically deformable material du'man- edge (3.3 ') of the roll.